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Contrast enhancement method based on dynamic range compression and electronic device thereof

A technology of dynamic range compression and contrast enhancement, which is applied in image enhancement, instrumentation, calculation, etc., can solve the problem of high computational complexity, and achieve the effect of reducing computational complexity and optimizing image contrast

Active Publication Date: 2020-01-21
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although regional contrast enhancement can produce better image contrast, the computational complexity of such methods is very high

Method used

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  • Contrast enhancement method based on dynamic range compression and electronic device thereof
  • Contrast enhancement method based on dynamic range compression and electronic device thereof
  • Contrast enhancement method based on dynamic range compression and electronic device thereof

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Embodiment Construction

[0040] Hereinafter, the present invention will be described in detail by illustrating various exemplary embodiments of the invention with reference to the accompanying drawings. Inventive concepts may, however, be embodied in many different forms and should not be construed as limited to the illustrative embodiments set forth herein. Furthermore, the same reference numerals may be used in the drawings to denote similar elements.

[0041] First, please refer to figure 1 , which shows a schematic diagram of an electronic device based on dynamic range compression according to an embodiment of the present invention. Such as figure 1 As shown, the electronic device 100 is used to adjust the input brightness values ​​P0-Pn of each pixel position in an input image Fr to enhance the contrast of the input image Fr, and output the adjusted final brightness values ​​P0'-Pn'. In this embodiment, the electronic device 100 can be a smart phone, a video recorder, a tablet computer, a note...

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Abstract

The invention provides a contrast enhancement method based on dynamic range compression and an electronic device thereof. A proper effective dynamic range is determined according to the occurrence frequency of an input brightness value of each pixel position in an input image; a global mapping curve is estimated accordingly, and then the output brightness value mapped by the input brightness valueis adjusted according to the regional characteristics of each pixel position in the input image so as to adaptively improve the contrast of the input image. According to the contrast enhancement method and the electronic device thereof, the calculation complexity can be reduced, and the better image contrast can be generated.

Description

technical field [0001] The invention provides a contrast enhancement method and its electronic device, in particular to a contrast enhancement method based on dynamic range compression and its electronic device. Background technique [0002] High dynamic range (such as 32-bit) images can capture images similar to real scenes, because it can retain a large amount of information such as brightness, contrast, and image details in real scenes. The dynamic range that can be displayed by a general display is, for example, 0˜255 (ie, 8 bits). In order to allow ordinary displays to present high dynamic range images, high dynamic range images are compressed and enhanced with appropriate image contrast to be close to the human visual experience. [0003] Image contrast enhancement can be mainly divided into global contrast enhancement and local contrast enhancement. Global contrast enhancement (such as gamma correction or histogram equalization) is to estimate a global curve with dy...

Claims

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Application Information

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IPC IPC(8): G06T5/00
CPCG06T5/92G06T5/90
Inventor 周旸庭姜昊天陈世泽
Owner REALTEK SEMICON CORP